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— Can you explain ____ you have been late for school several times this term?

— Sorry, but it is the first time that I have been late this week.

A.why it is that      B．how it is that

C．why is it that      D．how is it that

While ______ himself in the newspaper in a cafe , he got his pocket picked.   

A．having buried          B．buried

C．burying          D．to be buried

She says that she'll have to close the shop ________ business improves.

A. if            B. unless           C. after          D. when

The government must be very _____ about setting policies and make no decision until they are quite sure it is the right one.

A. particular     B. concerned     C. cautious         D. certain

 —Your colleague is speaking English with fluency.

—It's no wonder．She ____ in the UK for a year as a visiting professor

A. worked    B. has worked

C. had worked   D. has been working

—It rained cats and dogs this morning. I'm glad we took an umbrella.

—Yeah, we would have got wet all over if we   ________. 

A．hadn't          B．haven't         C．didn't          D．don't

In dealing with public relations, we should make every effort to prevent the _____ in personality.

A. contact     B. contrast      C. conflict      D. connection

It was not until he saw his mom _________.

A. did the little child stop crying

B. that the little child stopped crying

C. the little child stopped crying

D. when the little child stopped crying

Construction workers usually get ______ by the day.

A. pay          B. paying          C. paid          D. to pay

—Would you mind answering some questions on shopping habits?

— ________．

A. Yes, with great pleasure

B. No, I am afraid I can't make it

C. Yes, it is worth the time

D. No, as long as it doesn't take long